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gh-119180: Disallow instantiation of ConstEvaluator objects #124561

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Sep 25, 2024
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gh-119180: Disallow instantiation of ConstEvaluator objects #124561

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gh-119180: Disallow instantiation of ConstEvaluator objects
JelleZijlstra Sep 25, 2024
6f62d20
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JelleZijlstra Sep 25, 2024
3d62706
fix signature of repr()
JelleZijlstra Sep 25, 2024
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11 changes: 11 additions & 0 deletions Lib/test/test_type_params.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1452,3 +1452,14 @@ def f[T: (int, str)](): pass
self.assertEqual(annotationlib.call_evaluate_function(case.evaluate_constraints, annotationlib.Format.VALUE), (int, str))
self.assertEqual(annotationlib.call_evaluate_function(case.evaluate_constraints, annotationlib.Format.FORWARDREF), (int, str))
self.assertEqual(annotationlib.call_evaluate_function(case.evaluate_constraints, annotationlib.Format.SOURCE), '(int, str)')

def test_const_evaluator(self):
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T = TypeVar("T", bound=int)
self.assertEqual(repr(T.evaluate_bound), "<constevaluator <class 'int'>>")

ConstEvaluator = type(T.evaluate_bound)

with self.assertRaisesRegex(TypeError, r"cannot create '_typing\._ConstEvaluator' instances"):
ConstEvaluator()
with self.assertRaisesRegex(TypeError, r"cannot set 'attribute' attribute of immutable type '_typing\._ConstEvaluator'"):
ConstEvaluator.attribute = 1
3 changes: 2 additions & 1 deletion Objects/typevarobject.c
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Expand Up @@ -242,7 +242,8 @@ static PyType_Slot constevaluator_slots[] = {
PyType_Spec constevaluator_spec = {
.name = "_typing._ConstEvaluator",
.basicsize = sizeof(constevaluatorobject),
.flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_IMMUTABLETYPE,
.flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_IMMUTABLETYPE
| Py_TPFLAGS_DISALLOW_INSTANTIATION,
.slots = constevaluator_slots,
};

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